my_list = ["it",666,17.98]
print (my_list)

my_list[1] = "if"
print(my_list)

my_list.insert(1,"of")
print(my_list)

my_list.append([1,4,7])
print(my_list)

my_list = ["it",666,17.98]
my_list.extend([1,5,7])
print(my_list)
